Preamp Tubes for KR AUDIO 18 BSI

Mr Mcfarland, thanks for your reply =)

I never knew it has that much to know, i thoght it is just a tube.

The tubes are Ei- Yugoslavia ECC-82 an the other set are 5687WB.

The treble gone abit, never happen before, so i guess it is time to be replace them? They were long here...

So type of tubes should i be looking into replace them?

currently, it have all the juice from treble to bass, but the soundstage is not as clear and 3D as solid states amps, thats the field i want to improve on...

or that part is not done by tubes?

Please teach the silly me hehe, thanks =)

Hello Deramg. The two outside tubes are the 5687's. The 5687 is a dual triode developed for use in computers. The original nos tung-sol black plate 5687 is "far and away" the best sounding tube of that type. You may also substitute the 5687 with a 6900 or 7044 [ direct plug in replacements]The two inside tubes are 12au7/ecc82 dual triodes.The Ei ecc82 isn't a bad sounding tube but can be vastly improved upon with many brands of nos 12au7/ecc82 types but it is imperative that they are quiet and non microphonic. The early 60's vintage amperex bugle boys are terrific in that spot.

hehe, PERFECT =)

Thanks alot people, i guess i'll got hunt those tubes...

arhhh... does the 5687 has more variant?
There is only a pair of old 5687 out there and no 6900 or 7044.

Dual Triode - does it mean all dual triode can be use?
I saw a Tung Sol Gold Pin 12Ax7/Ecc803S is dual triode too...

Hello Deramg. No sir, you cannot use any dual triode tube. The 6900 or the 7044 will sub for a 5687 but do NOT use a 12ax7/ecc83 or ecc803 as they will not work.